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Wireless Charging Sonic Electric Toothbrushes
D/N: WAS-1972EN
Introduction
Wireless charging sonic electric toothbrushes are divided into two parts, a wireless charging
transmitter or charging base and a sonic electric toothbrush or toothbrush body. The charging base
mainly includes two functions, wireless charging transmission and ID identification. The toothbrush
body includes four functions, wireless charging reception, lithium battery charging/discharging
management, sonic motor control and LED indicators. The charging base is powered by a 5V USB
interface and provides power to the toothbrush body through LC resonance, which provides a one-
way communication function, so that the charging base can receive information and identify ID
information returned by the toothbrush body. The toothbrush body not only provides charging
management and LED capacity display functions during the charging process, but also controls the
sonic motor to execute the corresponding brushing mode according to the different setup operations.
The Holtek dedicated wireless charging MCU provides the required control signals mentioned
above. This application note will first introduce the operating principles of wireless charging and
then explain each function control process step by step. It allows users to have an increased
understanding of Holtek's wireless charging device.
Application Areas
Wireless charging sonic electric toothbrushes, wireless charging maglev razors.
WAS-1972EN V1.00
Wireless Charging Sonic Electric Toothbrushes
Figure 1. System Block Diagram
1 / 17
December 27, 2021
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Table of Contents
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Summary of Contents for Holtek WAS-1972EN
- Page 1 The Holtek dedicated wireless charging MCU provides the required control signals mentioned above. This application note will first introduce the operating principles of wireless charging and then explain each function control process step by step.
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Page 2: Operating Principles
According to different toothbrush body setup operations, the sonic motor can be controlled to swing from side to side with a corresponding amplitude and frequency to achieve different cleaning effects. WAS-1972EN V1.00 2 / 17 December 27, 2021... -
Page 3: Functional Description
The application solution consists of a charging base and a toothbrush body. Figure 2 shows the product hardware. Sonic electric toothbrush Button Mode indicator Charging indicator Charging base Figure 2. Product Hardware WAS-1972EN V1.00 3 / 17 December 27, 2021... - Page 4 NMOS, a programmable PWM circuit and a demodulation circuit. The toothbrush body uses the BP45F1330 as a master MCU and provides 2 K of Flash Program Memory, 14 bidirectional I/Os and an H-bridge drive circuit. WAS-1972EN V1.00 4 / 17 December 27, 2021...
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Page 5: Hardware Description
PGA and is demodulated using the appropriate CMP settings and then finally used for communication. Toothbrush Body Hardware Block Diagram Figure 4. BP45F1330 Toothbrush Body Hardware Block Diagram WAS-1972EN V1.00 5 / 17 December 27, 2021... - Page 6 Button A button switch is used to switch the operating modes. LEDs Three white LEDs are used to display the operating modes and one RGB LED to display the battery capacity. WAS-1972EN V1.00 6 / 17 December 27, 2021...
- Page 7 Modulation circuit Demodulation circuit Battery LED indicator Figure 5. BP45F0044 and BP45F1330 Electric Toothbrush Solution Circuits Layout and Hardware Considerations Figure 6. Toothbrush Body PCB Layout Figure 7. Charging Base PCB Layout WAS-1972EN V1.00 7 / 17 December 27, 2021...
- Page 8 Wireless Charging Sonic Electric Toothbrushes PCB BOM Table Table 1. Toothbrush Body BOM Table 2. Charging Base BOM WAS-1972EN V1.00 8 / 17 December 27, 2021...
- Page 9 Changes in current will allow the charging base to receive these differences. The toothbrush body data signal will be decoded by circuits such as a back-end amplifier and comparator. WAS-1972EN V1.00 9 / 17 December 27, 2021...
- Page 10 ID code of the charging base and the toothbrush body must be the same. In the Holtek provided program, a fixed parameter of 2 bytes will be used as the ID code and 1 byte of data will be used as user-defined data.
- Page 11 6. Countdown has completed: The correct ID is required to be received within 2.5 seconds after a successful demodulation operation, otherwise the PWM will be disabled and the program will be executed again after 2.5 seconds. WAS-1972EN V1.00 11 / 17 December 27, 2021...
- Page 12 5. Control capacity display: Refer to the capacity display control subroutine description below. 6. 100ms Timer: Execute every 100ms to process the related timer flags. 7. 1s Timer: Execute every 1s to process the related timer flags WAS-1972EN V1.00 12 / 17 December 27, 2021...
- Page 13 4. Operating mode 3: Motor rotates for 1.52ms and stops for 0.72ms. Only white LED3 is always on. Set the motor rotate/stop time in the main program and use the interrupt and counter to update the interrupt time and motor action. WAS-1972EN V1.00 13 / 17 December 27, 2021...
- Page 14 LED will be on. 3. During the charging process, the corresponding LEDs will be controlled with the breathing illumination effect. This is a continuous process of alternating from fading to brightening. WAS-1972EN V1.00 14 / 17 December 27, 2021...
- Page 15 API Name time_init API Function Timer initialisation Input Parameters Null Output Parameters Null Program Description After this API is executed, the timer for transmission control will be initialised. WAS-1972EN V1.00 15 / 17 December 27, 2021...
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Page 16: Reference File
PCB size and the number of required peripheral components resulting in simplified product development. Reference File Reference file: BP45F0044 & BP45F1330 Datasheet. For more information, consult the Holtek official website: www.holtek.com. Revision and Modification Information Modification Information Date... -
Page 17: Limitation Of Liability
Information displayed at such sites. Hyperlinks to other websites are at your own risk. Limitation of Liability In no event shall Holtek Limited be liable to any other party for any loss or damage whatsoever or howsoever caused directly or indirectly in connection with your access to or use of this website, the content thereon or any goods, materials or services.
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